Hall effect and transmission electron microscopy of epitaxial MnSi thin films

Meynell, S. A.; Wilson, M. N.; Loudon, J. C.; Spitzig, Alyson; Rybakov, Filipp N.; Johnson, MB; Monchesky, T. L.

doi:10.1103/physrevb.90.224419

Cited by 39 publications

(49 citation statements)

References 62 publications

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“…A muon-spin rotation study hints at possible additional magnetic phases 38 , and a combined Lorentz microscopy and Hall effect study claims to find evidence for in-plane helicoids and out-of-plane skyrmions 39 . However, these microscopy results can be explained by structural artifacts 40 and the small anomalous Hall effect is explained by non-adiabatic spin transport in the conical phase without a topological contribution from a skyrmion phase 41 .…”

Section: Introductionmentioning

confidence: 92%

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Neutron study of in-plane skyrmions in MnSi thin films

et al. 2017

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The magnetic structure of the in-plane skyrmions in epitaxial MnSi/Si(111) thin films is probed in three dimensions by the combination of polarized neutron reflectometry (PNR) and small angle neutron scattering (SANS). We demonstrate that skyrmions exist in a region of the phase diagram above at temperature of 10 K. PNR shows the skyrmions are confined to the middle of the film due to the potential well formed by the surface twists. However, SANS shows that there is considerable disorder within the plane indicating that the magnetic structure is a 2D skyrmion glass.

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Section: Introductionmentioning

confidence: 92%

“…The SANS data reveal that the skyrmion phase possesses a large degree of disorder, possibly due to the chiral grain boundaries. This work, together with previous transport measurements 29,41 will hopefully motivate further theoretical work to understand the Hall effect and the planar Hall effect in B20 thin films.…”

Section: Discussionmentioning

confidence: 99%

Neutron study of in-plane skyrmions in MnSi thin films

et al. 2017

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“…The resistance decreasing for perfect epitaxial ε-MnSi films is much stronger and reaches f ≈ 0.03. 6 Nevertheless, the attention should be paid to the similarity between R SG (T) and R SC (T) and its drastic difference from R DG (T) (Fig. 9).…”

Section: -9mentioning

confidence: 99%

“…[1][2][3][4][5][6][7] The perfect single crystal ε-MnSi with B20-type of structure possesses at low temperatures (≤ 30 K) intriguing magnetic and transport phenomena caused by formation of new magnetic quasiparticles -skyrmions (see Ref. 6 and references therein). On the other hand, the Mn x Si 1-x (x≈0.5) thin layers grown on Si(001) or Al 2 O 3 (0001) substrates demonstrate the high-temperature (HT) ferromagnetism (FM) with the Curie temperature T c of the order of room temperature.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetism of MnxSi1-x(x ∼ 0.5) films grown in the shadow geometry by pulsed laser deposition method

et al. 2016

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Absence of anomalous Nernst effect in spin Seebeck effect of Pt/YIG AIP Advances 6, 015018 (2016); 10.1063/1.4941340Dual resonant structure for energy harvesting from random vibration sources at low frequency AIP Advances 6, 015019 (2016) The results of a comprehensive study of magnetic, magneto-transport and structural properties of nonstoichiometric Mn x Si 1-x (x≈0.51-0.52) films grown by the Pulsed Laser Deposition (PLD) technique onto Al 2 O 3 (0001) single crystal substrates at T = 340 • C are present. A highlight of used PLD method is the non-conventional ("shadow") geometry with Kr as a scattering gas during the sample growth. It is found that the films exhibit high-temperature (HT) ferromagnetism (FM) with the Curie temperature T C ∼ 370 K accompanied by positive sign anomalous Hall effect (AHE); they also reveal the polycrystalline structure with unusual distribution of grains in size and shape. It is established that HT FM order is originated from the bottom interfacial self-organizing nanocrystalline layer. The upper layer adopted columnar structure with the lateral grain size ≥ 50 nm, possesses low temperature (LT) type of FM order with T c

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“…This specificity gives MAS an advantage as compared to electrical measurements such as the topological Hall effect, [17][18][19][20][21][22] which is more difficult to interpret because the signals are not unique to skyrmion phases or helical phases. [19][20][21][22][23][24] In this letter, we present a study of spin-wave dynamics in a single crystal of B20 FeGe using MAS. Specifically, we measure the gigahertz frequency dynamic susceptibility of FeGe using a field-referenced lock-in technique, which significantly increases our sensitivity to magnetic phase boundaries as compared to conventional MAS.…”

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confidence: 99%

Topological spin dynamics in cubic FeGe near room temperature

Turgut

Stolt

Jin

et al. 2017

Journal of Applied Physics

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Understanding spin-wave dynamics in chiral magnets is a key step for the development of highspeed, spin-wave based spintronic devices that take advantage of chiral and topological spin textures for their operation. Here we present an experimental and theoretical study of spin-wave dynamics in a cubic B20 FeGe single crystal. Using the combination of waveguide microwave absorption spectroscopy (MAS), micromagnetic simulations, and analytical theory, we identify the resonance dynamics in all magnetic phases (field polarized, conical, helical, and skyrmion phases). Because the resonance frequencies of specific chiral spin textures are unique, quantitative agreement between our theoretical predictions and experimental findings for all resonance frequencies and spin wave modes enables us to unambiguously identify chiral magnetic phases and to demonstrate that MAS is a powerful tool to efficiently extract a magnetic phase diagram. These results provide a new tool to accelerate the integration of chiral magnetic materials into spintronic devices.Identifying and understanding of spin-wave excitations in chiral and topological magnetic materials is a fundamental step towards their integration into spintronic devices. Moreover, some of these materials host magnetic skyrmions, in which spins form a topologically non-trivial excitation with an integer winding number. 1,2 Magnetic skyrmions can be driven to move by spin torques with an ultralow current threshold because there is weak or no pinning, 3,4 which makes them appealing for low-power memory, 5 magnetic logic, 6 and auto-oscillator 7 devices. In support of these potential applications, magnetic skyrmions have been investigated using several methods including Lorentz transmission electron microscopy (LTEM), [8][9][10] inelastic neutron scattering, 11,12 magnetic susceptibility, 13,14 and recently by microwave absorption spectroscopy. 15,16 Microwave absorption spectroscopy (MAS), in particular, is a powerful tool for identifying and studying dynamical magnetic excitations in materials. In materials with several complex magnetic phases, such as chiral magnetic materials with a volume Dzyaloshinskii-Moriya interaction, it may be possible to use MAS to quickly establish a magnetic phase diagram because the spin texture in each magnetic phase has a unique resonance response. This specificity gives MAS an advantage as compared to electrical measurements such as the topological Hall effect, [17][18][19][20][21][22] which is more difficult to interpret because the signals are not unique to skyrmion phases or helical phases. [19][20][21][22][23][24] In this letter, we present a study of spin-wave dynamics in a single crystal of B20 FeGe using MAS. Specifically, we measure the gigahertz frequency dynamic susceptibility of FeGe using a field-referenced lock-in technique, which significantly increases our sensitivity to magnetic phase boundaries as compared to conventional MAS. 15 We observe the resonance response in all the magnetic phases (field polarized, conical, helical and...

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Hall effect and transmission electron microscopy of epitaxial MnSi thin films

Cited by 39 publications

References 62 publications

Neutron study of in-plane skyrmions in MnSi thin films

Neutron study of in-plane skyrmions in MnSi thin films

Ferromagnetism of MnxSi1-x(x ∼ 0.5) films grown in the shadow geometry by pulsed laser deposition method

Topological spin dynamics in cubic FeGe near room temperature

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